mixed up是混在一起乱的意思，而confused则是混乱或者困惑的意思，区别可以从以下例子看出：
I am confused about him, I think I mixed up him with his brother, they look quite similar. 我对他很困惑，我想我把他和他的兄弟混在一起了，他们看起来很相似。
水利万物而不争,
而万物莫能与之争。
